kentaroajisaka

kentaroajisaka / tax-law-mcp

Public

MCP server for Japanese tax law — e-Gov API & NTA 通達 (administrative circulars)

tax-law-mcp.vercel.app
62
5
100% credibility
Found Mar 02, 2026 at 35 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
TypeScript
AI Summary

This project creates a helper for AI assistants like Claude to retrieve precise Japanese tax laws and official notices from government sources, preventing inaccurate responses.

How It Works

1
📖 Discover the tax helper

You hear about a simple tool that lets your AI chat pull exact Japanese tax laws and notices to give spot-on answers.

2
💡 Decide to add it

You choose to connect this helper to your Claude AI so it can check official sources instead of guessing.

3
✨ Easy connection

You copy one line into your AI's settings, and everything is ready—no hassle.

4
🚀 Start chatting

Now your AI can look up laws like 'income tax article 33' or notices by name when you ask tax questions.

5
🔍 Get real info

Your AI fetches the exact wording from government sites, shows it clearly with links, and builds a trustworthy answer.

😊 Reliable advice

You confidently get accurate tax guidance without worries about mistakes or made-up details.

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Star Growth

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AI-Generated Review

What is tax-law-mcp?

tax-law-mcp is a TypeScript MCP server that pulls official Japanese tax law texts, administrative circulars from the National Tax Agency, and 1,950+ tax appeal decisions via e-Gov API and site scraping. It equips AI tools like Claude to fetch verbatim articles—like所得税法 Article 33—using shortcuts (e.g., "所基通 33-6") to ground responses and kill hallucinations in tax queries. Run it via npx for Claude Desktop/VSCode, or deploy as a REST API with OpenAPI spec for Custom GPTs and other mcp server ai setups.

Why is it gaining traction?

Zero-install npx setup and Vercel deploys make it dead simple for mcp github copilot vscode or mcp server examples, unlike manual scrapers needing constant fixes for site changes. Preset aliases for 24 tax laws, 17 circulars, and appeal categories speed up real workflows, with caching and Shift_JIS handling for reliable pulls. Strong README doubles as mcp server tutorial, covering mcp github issues integration and REST endpoints for broader api use.

Who should use this?

Japanese tax accountants verifying AI advice on deductions or appeals; devs building mcp server python/n8n bots for compliance checks; lawyers querying "インボイス" cases via search_saiketsu. Ideal for mcp github project manager tools or administrative ai agents needing grounded tax data without building custom scrapers.

Verdict

Grab it if you're in Japanese tax—niche but battle-tested docs and MIT license beat generic scrapers. At 13 stars and 1.0% credibility, it's early but stable for mcp server list prototypes; watch for updates as e-Gov evolves.

(198 words)

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